Nut lock



C. L. DUNHAM.

NUT LOCK.

. 1,409,934, l Patented Mar. 21,1922.

UNITED STATES CHARLES L. DUNE-IAM, OF PENNSBOR-Q. WEST VIRGINIA.

NUT LOCK.

Specification of Letters Patent. K Vlgligen'tefl Mal'. 21, 1922.v

Application led. March 22, 1920. Serial No. 367,853.

To all Lv/0m t may concern.'

Be it known that I, CHARLES L. DUNHAM, a citizen of the United States, residing at Pennsboro, in the county of Ritchie and State of l Test Virginia, have invented certain new and useful Improvements in Nut Locks, of which the following is a specification.

My invention relates to new and useful means for locking male and female threaded elements together upon an object.

rlhe objects of my invention are to provide an efficientlocking means for securing an ordinary nut in fixed position upon a bolt; to provide a nut lock which may be used in locked' position upon a bolt either alone, or in combination with an ordinary nut; to provide a locking element of simple and economical construction adapted to securely hold and lock an object between said locking element and the head of a bolt; and to provide al locking element so constructed as to compensate for the contraction and eX- pansion of the members which it locks.

My invention consists in a resilient nut having a recessed or arched face adapted to engage the convex face of a common or ordinary nut, or the face of the object against which it is screwed.

My invention also consists in the details of construction and in the combination and arrangement of parts as herein set forth and claimed.

In 'the drawings:

Fig. l is a perspective view of a hexagon nut lock;

Fig. 2 is a perspective View of a bolt with two ordinary heXa-gon nuts with the nut lock interposed between the nuts in locking position;

F ig. 3 is a perspective view of a modified form of my nut lock.

Fig. i is a perspective view of a bolt showing two square ordinary nuts with the resilient nut lock interposed therebetween and engaging the convex surfaces of the nuts in locking position.

In the embodiment of my invention as illustrated, and which shows preferred constructions, the nut lock l is formed of comparatively thin resilient mate-rial having its engaging faces 2 recessed or arched to provide projecting engaging edges 3. lVhen it face of nut 4 and until the central portion of said nut lock is drawn into close proximity to nut t due to its resiliency. This willV cause the threads of the bolt and nut lock to engage each other at angles to each other thereby producing a binding and locking effect between the nut lock and bolt so that the nut 4, if there is space between it and the object on which the bolt is mounted, may be moved away from said nut lock as shown in F ig. l, without disturbing the locking relation of the nut lock upon the bolt.

The particular shape of the common or ordinary nut 4 is immaterial as it may be square, heXagon or any other desired shape and the form of the nut lock is also immaterial as it may also be square, heXagon or any other shape so long as it has at least one arched or recessed surface forming gripping edges to engage the nut or other object against which it is screwed to force the gripping edges into holding engagement with the object or the nut, while the central portion of the nut lock is forced downwardly to form a binding locking engagement between the nut lock and bolt. In screwing the nut lock into such position the lower arch or concavit of the nut lock will be partially or nearly attened out, depending upon the degree of tightness that the gripping edges are screwed upon the nut. At the same time the depth of the upper concave surface will be correspondingly increased and the tighter the nut lock is turned, the more secure will be the locking engagement.

An important advantage of my improved nut lock, consists in providing for contraction and expansion of the bolt and nut and object on which they are secured, since the resiliency of the locking member Will compensate therefor.

In cases where there is unusual vibrationof parts and greater holding strength is" desired, an additional ordinary nut 7 may be screwed onto the bolt in engagement with the upper side of the nut look until the and an interposed resilient locking element gripping,r edges are in locking engaffement having a threaded openingr therethrough and With sald nut as shown in Fi 2 and f1. having arched surfaces engaging seid conl0 What I claim as new and vesire to secure Vex surfaces respectively, substantially es by Letters Patent is: set forth and for the purposes speciiied.

A bol-t, two ordinary nuts having 4their l convex surfaces disposed toward's'each other Y CHARLES L. DUNHAM.Y 

